I changed my 2.73 10 bolt to a 3.70 9 bolt. I didn’t change the Speedo gears because; well I could care less about my speed. I was wondering if the speed difference would after my car adversely. Does the Speedo effect like torque converter lock up or what gear the car down shifts to or anything like that?

 

The only thing I believe it affects would be your odometer.

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'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER, NO CAT
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
3:73 Posi
Rebuilt 700R4 vette servo and .500 boost valve
B&M Megashifter, 5" Autometer Tach w/shift lite
Soon to be installed
3" Hooker Aero Chamber

 

Do any of you know if our cars have vehicle speed sensors? Ive heard like 5 different answers.

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1980 Camaro, '88 Police 350 engine, Headers, full exhaust, completely redone, my baby!
1988 Iroc-Z L98, MSD 6a, Accel coil, K+N's, Airfoil, Coolant Bypass, Flowmaster, Gears, Late model Bose, I like the 80 better

 

Spindr, How was the performance gain in the swap? Is your mileage suffering any?

 

Speedo will be a little off and you will rack up miles a little faster but that is it.(for a '91 anyways}
Changed gears and never did the speedo thing
myself.

 

I went from 2.73->3.73 and it threw my speedo off 10mph at 40 (shows 50), 25 at 55 (80) and 35 at 70 (105).

I didn't affect my torque converter but it affected my speed limiter. 72mph was my top speed. The converter is affected by speed and rpm but with the shifting difference it doesn't cause any problems.

The speedo fix cost me $7 and less than one hour.

RICHRAD- I lost about 3mpg overall. I was getting 23mpg city and now I'm getting 20mpg. Not that much of a difference for the performance gain I got.

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